Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..227w&link_type=abstract
Astronomy and Astrophysics, vol. 108, no. 2, Apr. 1982, p. 227-242.
Astronomy and Astrophysics
Astronomy
128
H Ii Regions, Hydrogen Recombinations, Line Spectra, Radio Astronomy, Radio Sources (Astronomy), Astronomical Maps, Continuous Radiation, Emission Spectra, Physical Properties, Radio Interferometers, Radio Telescopes, Thermal Radiation
Scientific paper
Ninety-one sources that appeared to be point sources when observed with the angular resolution of the 100-m telescope at 4.9 GHz, and that were expected to be H II regions, were examined. Five sources were found to be nonthermal, one source was a planetary nebula and the remaining 85 sources were H II regions. Distance estimates were obtained for 50 of the 85 H II regions, and their physical parameters were determined. Approximately 85% of 25 H II regions observed with the NRAO interferometer appeared to contain one or more compact components, with excitation parameters equal to or larger than that of an 09.5 star. Four of the compact components have electron densities greater than 10,000/cu cm, and thus, the sources belong to the class of the most compact H II regions observed at radio frequencies so far.
Altenhoff Wilhelm J.
Mezger Peter G.
Wink Jörn E.
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